1839989 has 4 divisors (see below), whose sum is σ = 1863360. Its totient is φ = 1816620.

The previous prime is 1839983. The next prime is 1839991. The reversal of 1839989 is 9899381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9899381 = 89 ⋅111229.

It is a cyclic number.

It is not a de Polignac number, because 1839989 - 2¹⁶ = 1774453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1839983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11567 + ... + 11724.

It is an arithmetic number, because the mean of its divisors is an integer number (465840).

2^1839989 is an apocalyptic number.

It is an amenable number.

1839989 is a deficient number, since it is larger than the sum of its proper divisors (23371).

1839989 is an equidigital number, since it uses as much as digits as its factorization.

1839989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23370.

The product of its digits is 139968, while the sum is 47.

The square root of 1839989 is about 1356.4619419652. The cubic root of 1839989 is about 122.5382693150.

The spelling of 1839989 in words is "one million, eight hundred thirty-nine thousand, nine hundred eighty-nine".